Maybe another picture will help you see what I am saying?
It clearly shows JUMO 004 with inner wing not swept.
I posted this image above btw.
As explained that if you put additional weight on the plane and you put it ALL forward you have a shift CoG forward.
So you will need to put some of that extra weight behind as well, just logic.
Anbd looking at the image you posted you will see that the Jumo is much fatter engine as well and has much more bits and pieces in front - it does put a lot of additional weight in front as well.
You try to make it look like only weight in the rear was added, which is false.
The books I quoted above say in their short introcductions the same as Stormbirds does - wings swept to correct CoG.
In their short overviews.
In their detailed development history they state 'inner wings' for CoG early in development and inner wings for said aerodynamic problems with airflow later, much later in development, using V3 which was used for high speed testing, with Jumo 004 already, as seen on the link posted above.
The reason why Stormbirds does not go into he detail is likely that they write about 'plagiarism' in that article - and not about developmnt history.
++++